MATLAB: A Practical Introduction to Programming and Problem Solving
MATLAB: A Practical Introduction to Programming and Problem Solving
5th Edition
ISBN: 9780128154793
Author: Stormy Attaway Ph.D. Boston University
Publisher: Elsevier Science
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Chapter 14, Problem 11E
To determine

Whether the mean or the median would be better for the student if the three recorded grades were 99,88,95 or if the grades were 99,70,77.

Expert Solution & Answer
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Answer to Problem 11E

Solution:

The median would be better for the student.

Explanation of Solution

The given data is,

A=99,88,95B=99,70,77

The formula to calculate the mean of set of data is,

Mean(x¯)=x1+x2+...+xnn=i1nxin

Here, xi is the ith data value and n is the number of data values in the data set.

Substitute 99,88,95 for x1,x2,x3 respectively in the formula.

Here number of data in the given data set is 3, substitute 3 for n in the formula.

Mean(x¯)=x1+x2+...+xnn=99+88+953=94

Mean of A is 94.

Substitute 99,70,77 for x1,x2,x3 respectively in the formula.

Mean(x¯)=x1+x2+...+xnn=99+70+773=82

Mean of B is 82.

The formula to calculate the median of set of ordered data is,

Median={(n+12)thvalue,n=odd12[(n2)thvalue+(n+12)thvalue],n=even

Here n is the number of data values in the data set.

Arrange the given data in increasing order.

A=88,95,99B=70,77,99

Number of values in data set is 3, it is even.

Substitute 3 for n in the formula for odd number of data set A.

Median=(n+12)thvalue=(3+12)thvalue=2ndvalue=95

The median of A is 95.

Substitute 3 for n in the formula for odd number of data set B.

Median=(n+12)thvalue=(3+12)thvalue=2ndvalue=77

The median of B is 77.

Since, mean deviation about mean is zero, whereas, mean deviation about median is minimum. Hence, median would be better for the student.

MATLAB Code:

A = [99 88 95];

B = [99 70 77];

mean_A = mean(A)

mean_B = mean(B)

median_A = median(A)

median_B = median(B)

Save the MATLAB script with the name, Chapter14_54793_14_11E.m in the current folder. Execute the script by typing the script name at the command window to generate output.

Result:

MATLAB: A Practical Introduction to Programming and Problem Solving, Chapter 14, Problem 11E

Therefore, the required program is stated above.

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